Throw-off attachment for printing-presses.



Nn. 667,772. Patented Feb. I2, I90I.

S. HALVURSUN.

THROW0FF ATTACHMENT FOB PRINTING PRESSES.

(Application led Aug. l5. 1900.) (llo Modei.) 3 Shoots-Sheet l.

' No. 667,772. Patented Feb. l2, |901.

s. HALvunsoN. THROW-UFF ATTACHMENT FIOR PRINTING PRESSES.

(Applicstion led Aug. 15, 1900.) (Nr.- ldodsl.) 3 Shoah- Sheet 2.

No. 667,772. Patented Feb. |2,'|9o|.

s. HALvonsoN. THROW-UFF ATTACHMENTFDB PRINTING PRESSES.

(Application tiled Aug. 15. 1900.) (No Model.) 3 Sheets-Sheet 3.

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SEVERIN HALVORSON, OF CHICAGO, ILLINOIS, ASSIGNOR TO THE BARNHART BROTHERS da SPINDLER, OF SAME PLACE.

THRW=OFF ATTACHENT FOR PRINTING-PRESSES.

SPECIFICATION forming part of Letters Patent No. 667,772, dated February 12, 1901.

Application filed August 15, 1900l Serial No. 26,990 (No model.)

To all whom t may concern: the upper end of the swinging block or mem- Be it known that I, SEVERIN HALVORSON, a ber B and is understood to carry the form. citizen of the United States, residing at Chi- The memberBis arranged for swinging movecago, in the county of Cook and State of Illiment, as by being supported by a pivot axis 55 nois, have invented a certain new and useful or shaft b, extended through its lower end. Improvement in Throw-Off Attachments for The bed A is thus enabled to swing back and Printing-Presses, (Case No. 1,) of which the forth toward and away from the platen C, following is a full, clear, concise, and exact which is arranged at the upper end of the description, reference being had to the acframe D. The mechanism illustrated for re- 6o 1o companying drawings, forming a part of this ciprocating the swinging bed toward andaway specification. from the platen comprises rotary disks E E, My invention relates to throw-off mechanone bein-g understood to be arranged on each ism for printing-presses--that is, to mechanside of the machine, links F F, having their ism by which a printing-press can be sc arforward ends connected to cranks on the 65 ranged that it may operate for any given time disks E E, and a rotary or rock shaft G, ar-

without causing the taking of impressions. ranged in the rear of the bed A and adapted In mechanisms of this kind the bed-operating for connection at its opposite ends with the mechanism in a movable-bed press is arranged rear ends of the links F F. The rotary disks in such a Way that for any desired period of E E can be rotated in any suitable way, as 7o zo time the bed will not be moved quite far by meshing gear-wheels H and H', the gear enough to the platen to cause an impression H being on the main driving-shaft J. In to be made upon the paper held by thelatter. this way a continual rotation of the disks The bed will therefore be reciprocated toward E E causes a continual reciprocation of the and away from the platen in the usual way; bed A toward and away from the platen C, 75 but the stroke will be in the rear of its preand this reciprocation is such as to cause the vious or normal path of travel, so that the bed to press the form against the paper or form carried by the bed fails to reach the other material carried by the platen. In the platen by about an eighth or a quarter of an diagram forming Fig. 3 the two straight lines inch, as the case may be. in the middle of the diagram illustrate the 8o 3o The object of my invention is to provide a Way in which the bed comes close and parallel simple, practical, and improved mechanism to the platen. of this kind. Of course my improved attachment can be To the attainment of this and other desired applied to any other press. The press herein ends, my invention consists in matter hereinshown is illustrated merely as an example. 85 after set forth. In accordance with my invention the rock- In the accompanying drawings, Figure l is shaft G in the rear of the swinging bed A isv a side elevation of a printing-press provided provided with eccentric pins or cranks g, and with anattachment embodying myinvention, the rods F F are connected with these pins only so much of the press being shown as is or cranks. The shaft Gis also provided with 9o 4o necessary to illustrate its operation and it bea rear extension g, whose outer end is coning shown in its normal condition, so as to nected with a link K, which extends downoperate to take impressions. Fig. 2 is asimiwardly toward the fixed end of the swinging lar side elevation with the attachment opermember B. The rod or link K is provided ated or thrown off so as to cause the press to with two notches kk,each of which is adapted 95 operate without takingimpressions. Figs. 3 to engage with the pivotal shaft b ,of the and 4 are diagrams illustrating the effect of swinging member B. In this way it will be the throw-off mechanism upon the stroke of seen that when the lower notch lo of the rod the bed; and Figs. 5 to 10, inclusive, are K is in engagement with the pivotal shaft b views of details of construction. the rock-shaft G will be in its normal posiroo 5o The printing-press illustrated in the drawtion and the press will operate so as to take ings comprises a bed A, which is arranged at an impression at each stroke. When, however, the rod K is drawn down, so as to cause its upper notch 7s to engage with the pivoted shaft b, it will swing or rotate the rock-shaft G, and thereby throw the bed slightly to the front or away from the platen. The swinging of the swinging member B will therefore canse the bed A to reciprocate toward and away from the platen, as before, but the entire throw will be in advance of the normal throw, so that the bed will fail to reach the platen. This is illustrated in Fig. 4, in which the two substantially Vertical middle lines represent, respectively, the platen in the position in which the former approaches most closely to the latter.

It will be seen that by having the pivotal point of the rod or link K coincident with the pivot of the swinging member B, which supports the bed, all of the parts swing or rotate about a common axis, so that when the press is operating the throw-oit mechanism will not cause any rotation of the shaft G, as would be the case if the link K were pivoted eccentrically to the pivot-shaft b of the swinging member B.

As an arrangement for shifting the rod or link K so as to place either one or the other of its notches in engagement with the shaft b I have shown a bell-crank L arranged upon the shaft b and having one of its arms provided with a slot or guideway and the link K provided with a pin carrying a thimble K2, which fits into the slot in the bell-crank arm. The slot or guideway is provided with a springactu ated plunger Z, arranged to normally press inwardly upon the thimble k2, and thereby hold the same normally at the base of the slot. The other end of the bell-crank L is connected with a link M, and this in turn is connected with the lower end of a hand-operated throw-off lever O, which is pivotally connected to the machine-frame D. By such arrangement a movement of the hand-lever O to its forward position, as shown in Fig. 2, willcause the bell-crank to swing downwardly, and thereby lift the end of the link K out of engagement with the pivoted shaft b and swing it downwardly, so as to cause the bed to occupy a backward position and the press to operate with the bed thrown oft. When the hand-lever O is swung in the opposite direction, so as to occupy the position shown in Fig. l, it will swing the bell-crank L in the opposite direction, and thereby cause the end of the link K to be disengaged from the pivoted shaft b, and then upwardly, so that its lower notch 7c will engage the shaft. In this way the platen will be restored to its normal position and the press will operate to take impressions.

The operation of the bell-crank L, in connection with the link K, is illustrated in detail in Figs. S, 9, and l0. In Fig. 8 thelink K is illustrated in its elevated position. In Fig. 9 it is shown in its lower position, and in Fig. l() it is shown disengaged from the pivoted shaft Z7 and passing from one position to the other. It will be seen that my invention is simple and involves but a minimum number of parts. It will also be seen that it can be readily added to the printing-presses constructed without the throw-off arrangement, as well as embodied in new printing-presses. In fact, this latter is one great feature of novelty and utility in the attachment, for the reason that it can be so easily applied to old presses. It will also be seen that the attachment is effective and eicient in its operation and involves the smallest possible amoun t of wear and tear upon the parts.

1. The combination with the platen and the pi voted swinging member which supports the bed, of means for reciprocating said swinging member, a link connected with the bed-reciprocating mechanism for varying the stroke of the same, a bell-crank having one of its arms in engagement with said link, whereby by the movement of the bell-crank the link can be adjusted longitudinally, and means for operating the bell-crank so as to swing the same from one to the other of two positions, in one of which the reciprocating mechanism operates the bed so as to take impressions, and in the other of which the reciprocating mechanism fails to bring the bed to the platen, the bell-crank being arranged so that in both of said positions the link extends radially from the pivotal point of the swinging member, and an elastic connection between the link and the bell-crank, whereby the link can swing about such pivotal point of the swinging member instead of about its connection with the bell-crank, substantially as described.

2. The combination with the platen and the pivoted swinging member which supports the bed, of mechanism for reciprocating said swinging member, a link connected with said bed reciprocating mechanism for varying the stroke of the same, the said link having its lower end provided with means for engaging the pivot-shaft of the swinging member at two different points, a bell-crank having one of its arms in engagement with said link, whereby when the bell-crank is rotated the link will be adjusted longitudinally so as to cause its engagement with the pivot-shaft at one or the other of said two points, and means for swinging the bell-crank, substantially as described.

3. The combination with the platen and a swinging member which supports the bed; of means for reciprocating the bed toward and away from the platen; a rock-shaft to which said reciprocating means are eccentrically connected; a rod extending from an extension or projection on the rock-shaft, and having two notches, each adapted to engage the pivotal shaft of the swinging member, and also having a pin arranged to project laterally from between said notches and carrying a thimble; a bell-crank having a slot adapted to receive said thimble and provided IOO IIO

lwith spring means for forcing the same to the bottom of the slot; a link connected tov a bellcrank having one of its arms slotted so 15 as to receive a projection arranged upon said link; spring means normally pressing inwardly upon said projection; a link connected With the other arm of the bell-crank; and a lever pivotally connected With said link, subzo stantially as described.

In witness whereof I hereunto subscribe my name this 7th day of August, A. D. 1900.

SEVERIN HALVORSON;

Witnesses:

A. MILLER BELEIELD, GEORGE L. CRAGG. 

